Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 2,016	$ 370	$ 1,734
Restricted Cash and Cash Equivalents in Other current assets	184	288	208
Restricted Cash Equivalents in Other long-term assets	53	42	52
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	2,253	700	1,995	$ 607
Other Current Assets [Abstract]
Restricted Cash and Cash Equivalents in Other current assets	184	288	208
Derivative Asset, Current	190		133
Licensing arrangements	146		148
Other Assets, Miscellaneous, Current	335		263
Other Assets, Current	855		751
Trade accounts receivable, net
Accounts receivable	1,733		1,637
Less: allowance for doubtful accounts	(101)		(105)
Trade accounts receivable, net	1,631		1,531
Allowance for doubtful accounts
Beginning balance	105	74
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)		10
Charges to expenses	2	9
Utilization of allowances	(6)	(6)
Ending balance	101	87
Inventories
Inventory, Finished Goods, Net of Reserves	921		893
Inventory, Work in Process, Net of Reserves	120		109
Inventory, Raw Materials, Net of Reserves	366		349
Inventories	1,407		1,351
Property, plant and equipment, net
Land	104		104
Buildings and improvements	1,298		1,292
Equipment, furniture and fixtures	3,462		3,465
Capital in progress	418		446
Property, plant and equipment	5,282		5,308
Less: accumulated depreciation	3,229		3,224
Property, plant and equipment, net	2,053		2,084
Supplemental Balance Sheet Information
Depreciation expense	83	76
Other Assets, Noncurrent [Abstract]
Restricted cash equivalents included in Other long-term assets	53	$ 42	52
Operating Lease, Right-of-Use Asset	407		458
Derivative Asset	209		109
Investments	643		918
Licensing arrangements, asset	191		218
Other, Other Long-term Assets	211		166
Other Assets, Noncurrent	1,714		1,921
Accrued expenses
Legal reserves, current	415		505
Payroll and related liabilities	710		681
Accrued Rebates, Current	335		331
Business Combination, Contingent Consideration, Liability, Current	23		26
Other	578		656
Accrued Liabilities, Current	2,060		2,197
Other Liabilities, Current [Abstract]
Deferred Revenue, Current	139		138
Accrued Royalties, Current	148		153
Taxes Payable, Current	151		158
Disposal Group, Including Discontinued Operation, Liabilities, Current	0		200
Other Sundry Liabilities, Current	268		307
Other Liabilities, Current	705		958
Other long-term liabilities
Accrued income taxes	557		547
Estimated Litigation Liability, Noncurrent	41		64
Business Combination, Contingent Consideration, Liability, Noncurrent	375		171
Licensing arrangements, liability	208		253
Operating Lease, Liability, Noncurrent	353		401
Deferred Revenue	264		257
Other Accrued Liabilities, Noncurrent	572		615
Other long-term liabilities	$ 2,370		$ 2,309